Which structure of the eye is matched appropriately with its developmental origin?
a. ectoderm ? cornea
b. crystallin ? cornea
c. optic cup ? lens
d. crystallin ? retina
e. mesoderm ? retina
ANSWER: a
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What is the effect of aflatoxins on humans?
a. cause hallucinations b. cure bacterial infections c. cure viral infections d. make stored foods toxic to the liver
The region between two adjacent “Z lines” is known as a ____
a. muscle fiber b. sarcomere c. tendon d. ligament e. myofibril
Natural selection is based on all of the following except:
A. the best-adapted individuals tend to leave the most offspring B. genetic variation exists within populations C. populations tend to produce more individuals than the environment can support D. individuals adapt to their environments and thereby, evolve E. individuals who survive longer tend to leave more offspring than those who die young
Four of the five answers listed below are characteristic of meiosis. Select the exception
A) Involves two divisions B) Produces haploid cells C) Reduces the number of chromosomes D) Involves synapsis E) Results in producing genetically identical cells